**Enhancing Biogas Production and UASB Start-Up by Chitosan Addition**

Chantaraporn Phalakornkule1,2 and Maneerat Khemkhao2

*1Department of Chemical Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok, 2The Joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi, Thailand* 
